卡拉库尔羊妊娠母羊铜、锌、铁、锰的含量测定

为了探索微量元素对妊娠母羊营养状况的影响,选取体重相近、年龄和胎次相同的卡拉库尔羊妊娠母羊和空怀母羊各6只,清晨采取颈静脉血样和臀部毛样,利用原子吸收光谱法对铜、锌、铁、锰4种微量元素含量进行了测定(国标法)。结果表明:血清中,铜的含量在妊娠母羊与空怀母羊之间差异显著(P<0.05);全血中,铁、铜、锰含量在妊娠母羊与空怀母羊之间差异显著(P<0.05);羊毛中,铜、锰含量在妊娠母羊与空怀母羊之间差异显著(P<0.05)。     

库布齐沙漠东部植被恢复对土壤生态化学计量的影响

为阐明植被恢复对风沙土生态化学计量特征的影响,以库布齐沙漠东段流动沙地、半固定沙地、油蒿固定沙地和沙柳固定沙地为研究对象,分析植被生物量和不同深度土层（0～60 cm）土壤C、N、P化学计量特征时空变化及其相关性。结果表明：（1）土壤C、N含量随植被恢复明显增加,而土壤P含量增幅较小,均在沙柳固定沙地达到最大值(5.86 g·kg^-1、0.41 g·kg^-1、1.74 g·kg^-1),各阶段土壤C、N、P含量均随土层加深逐渐降低,土壤P含量在各土层间差异较小。（2）不同阶段或土层间土壤化学计量比差异显著,随植被恢复土壤C:N先减小后增大,而C:P和N:P均逐渐增大,土壤C:P和N:P均随土层加深逐渐减小,而C:N则无明显变化规律。（3）土壤C、N、P两两间呈极显著正相关,均与地上和凋落物生物量呈显著正相关,土壤C:N与C:P、N:P均无显著相关关系,而土壤C:P与N:P呈显著正相关,且土壤C:P和N:P均与地上、地下和凋落物生物量呈显著正相关。综上所述,人工建植促进植被恢复可显著影响土壤C、N、P含量及化学计量特征,进而...     

追踪实战基本技能的训练

警犬追踪实战情况错综复杂,既有客观条件的变化,如案件性质、使用条件、现场环境和地理气候等;又有主观因素的影响,如人的分析判断能力、犬的作业状况等。面对各种各样复杂的现场,带犬民警作为警犬使用的主体,必须具备对案件现场勘察、分析、判断的基本功,具有正确指挥和使用警     

保润剂对烟草叶表面微结构的影响

\t\t\t\t\t目的\t\t\t\t\t考察金钱草多糖保润剂对片烟原料干燥过程的影响规律,为从动力学角度理解保润剂对片烟原料的保润效果奠定理论基础。\t\t\t\t\t\t\t\t\t\t\t\t\t方法\t\t\t\t\t测试施加金钱草多糖保润剂的许昌片烟(X2F)原料在不同干燥温度的水分含量变化,确定原料水分散失的薄层干燥动力学方程,获得内部水分有效扩散系数及干燥活化能。\t\t\t\t\t\t\t\t\t\t\t\t\t结果\t\t\t\t\t金钱草多糖可增强片烟原料的持水能力,显著降低原料的干燥速率常数和水分有效扩散系数,添加纯水和施加保润剂原料的水分有效扩散系数分别在1.286 8×10⁻¹²~1.671 8×10⁻¹² m²/s和1.074 0×10⁻¹²~1.611 0×10⁻¹² m²/s之间,干燥活化能分别为8.42 kJ/mol和13.9 kJ/mol。\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t结论\t\t\t\t\t金钱草多糖可提高片烟原料的保润性能,二项分布指数函数模型和Page模型可较好地描述片烟原料水分散失历程,为从动力学角度理解保润剂对片烟干燥过程中水分散失的影响提供了思路。\t\t\t\t     

干旱区矿区不同立地类型土壤种子库特征

矿区的自然或人工植被恢复是维持生物多样性及生态系统稳定的重要途径。通过室外萌发法对金昌镍铜矿区7种不同立地生境土壤种子库的研究表明:该区域土壤中物种丰富度较高,包括16科47属,共56种植物,分别为:藜科(Chenopodiaceae)、禾本科(Gramineae)、菊科(Compositae)、柽柳科(Tamaricaceae)、苋科(Amaranthaceae)、马齿苋科(Portulacaceae)、豆科(Leguminosae)、十字花科(Cruciferae)、车前科(Plantaginaceae)、胡颓子科(Elaeagnaceae)、蒺藜科(Zygophyllaceae)、莎草科(Cyperaceae)、大戟科(Euphorbiaceae)、紫草科(Boraginaceae)、蔷薇科(Rosaceae)、茄科(Solanaceae);植物组成以一年生草本植物占绝对优势(89.3%),多年生草本植物次之(7.54%),灌木种最少(2.59%)。土壤种子平均储量412粒·m~(-2),不同立地类型土壤种子库储量差异显著,与其他荒漠地区比较,土壤种子库储量偏低;土壤种子库物种Simpson多样性指数为:新尾矿周边自然植被区龙首矿自然植被区龙首矿开采废弃地供暖公司柽柳林地。     

磷酸铵在三种典型土壤中的转化及其有效性

研究了磷酸二氢铵(MAP)和磷酸氢二铵(DAP)在3种典型土壤中的转化,并评价了其有效性.结果表明:施用磷酸铵可改变肥际微域土壤的pH值,并且这种效应可持续几个月;MAP在黑土中,反应产物主要为Al-P,占38.8%,其次为Fe-P,占12%;在潮土中,Ca_2-P是主要形态,占34%,其次为Ca_8-P,占28%;在水稻土中,We-P是主要形态,占50%以上,其次为Ca_2-P,占20%.在黑土中We-P在DAP处理中所占的比例较MAP处理中高,而Al-P和Fe-P所占的比例正好与之相反;在最初的10 d里,We-P下降显著,随反应时间延长,DAP和MAP处理间We-P所占的比例差异减小;MAP在水稻土中的有效性最高,其次是潮土和黑土;在黑土中DAP的有效性较MAP要好,MAP主要转化成了Al-P.     

Hemodynamic changes of abdominal organs in the early stage of septic mice induced by cecal ligation and puncture

AIM: To characterize the hemoperfusion of abdominal organs in the early stage of sepsis in mice. METHODS: Health male Kunming mice were used in the study (n=100). The techniques of 2D, M-mode and pulse-wave Doppler were applied to evaluate the systolic functions of the heart and the blood flow of abdominal aorta, right renal artery and portal vein before cecal ligation and puncture (CLP) as the baseline and at the time points of 12 h, 24 h, 36 h, 48 h and 60 h after CLP. The mice survived for 7 d were considered as survivals. All data were compared with the baseline values.RESULTS: The cardiac output of the CLP mice remained in normal or hyperdynamic levels in the early stage of sepsis. Compensatory responses of systolic functions were observed. The levels of blood flow in abdominal aorta were increased first and then decreased. Resistent index (RI) and pulsatility index (PI) of abdominal aorta began to increase at the time point of 24 h. Blood flow of right renal artery showed a significant decline from the beginning to the end of our observation. No significant difference of the right arteriorenal RI and PI was observed. Portal venous flow increased significantly at 12 h, and decreased at 24 h after CLP. Congestion index of the portal vein was distinctly increased from 12 h to the end of the observation. CONCLUSION: The hemodynamics of abdominal organs in early stage of septic mice shows specific changes, indicating an important role in evaluating the mechanism of sepsis.     

Mechanism of RhoA on vascular reactivity following hemorrhagic shock in rats

AIM: To observe the mechanisms of RhoA on vascular reactivity following hemorrhagic shock (HS) in rats. METHODS: The superior mesenteric artery (SMA) in rats subjected to hemorrhagic shock was adopted to assay the vascular reactivity via observing the contraction initiated by norepinephrine (NE) with isolated organ perfusion system. Meanwhile, the effects of Rho kinase, myosin light chain phosphatase (MLCP), myosin light chain kinase (MLCK) on RhoA regulating vascular reactivity were observed. The effects of RhoA agonist U-46619 and inhibitor C3 enzyme on the activities of Rho kianse, MLCP, MLCK and phosphorylation of MLC20 in the vascular smooth muscle cells (VSMC) with hypoxia were also measured. RESULTS: As compared to control group, the cumulative dose-response curves of SMA to NE at 2 h after shock shifted to the right, the maximal contractions (Emax) of NE was significantly decreased. RhoA agonist U-46619 increased the vascular reactivity in the late period of shock. C3 enzyme abolished U-46619 induced the increase in the contractile response of SMA to NE. Rho kinase inhibitor Y-27632 decreased U-46619-induced the increase in the vascular reactivity, MLCP inhibitor calyculin further promoted the increase in the vascular reactivity. However, MLCK inhibitor had no effect on the U-46619-induced change of vascular reactivity. After hypoxia, the activities of Rho kinase and MLCK, and the level of MLC20 phosphorylation were decreased, MLCP activity was increased. RhoA agonist U-46619 increased the activity of Rho kinase and phosphorylation of MLC20, decreased the activity of MLCP, but had no effects on MLCK activity. CONCLUSION: RhoA plays an important role in the regulation of vascular reactivity following shock. The mechanism is closely related to regulating the activities of Rho kinase and MLCP, and increasing the phosphorylation of MLC20 in VSMC.     

麻栎 马尾松天然次生混交林生物量结构及根系分布特征调查研究

通过对马尾松、麻栎天然次生混交林林分生物量的测定,对林分生物量积累、根系分布特征的差异进行了研究。结果表明,两类树种混交造林方式能在一定程度上提高树干的生产量,天然次生麻栎较马尾松具有主根、水平根系均发达,且须根分布均匀的特点。     

木本婆婆纳‘维力镜像’的组培快繁技术

木本婆婆纳（Hebe）原产澳洲,主要分布于新西兰和澳大利亚的东南部,全属约100种,栽培品种超过800个,是一类观赏常绿花灌木.在澳洲和欧洲,被广泛应用在观赏园艺和庭院绿化上,并对Hebe属植物的育种和栽培做了大量的研究.近年来,我国也开始逐步认识和引种Hebe属植物,并有少量用于生产,但组培方面的研究国内尚未见报道.